SoftBody GarbageCollect() and RemoveReferences()

[sinoth]

I'm tinkering with SoftBody rope and can't figure out when to use a few functions present in the demo. Specifically:

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m_sparsesdf.RemoveReferences()
m_sparsesdf.GarbageCollect()

Can anyone explain what these do? RemoveReferences seems to be called only on init, but GarbageCollect is called every step. I tried looking at the source to figure it out but I don't understand a bit of it :/